<!DOCTYPE html>
<style>
#box {
  width: 100px;
  height: 100px;
  background-color: #00ff00;
  /* Force compositing. */
  backface-visibility: hidden;
}

#covered {
  width: 100px;
  height: 100px;
  background-color: #ff8080;
}

#scroller {
  overflow: visible;
  height: 100px;
  width: 100px;
  /* Force compositing of the scroller. */
  backface-visibility: hidden;
}

#contents {
  height: 1000px;
  width: 100%;
}
</style>

<div id="box"></div>
<div id="covered"></div>
<div id="scroller">
  <div id="contents"></div>
</div>
